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  1. #1
    mtbr member
    Join Date
    Apr 2013

    seat post shim....

    Hi Folks...My Crankbrothers hydraulic seat post died. Is it safe to use a 30.9 hydraulic seat post with a shim to 31.6 to fit my Ibis hd? The actual shim is 100mm and is much shorter than the length of the kronolog. Happy racing!

  2. #2
    mtbr member
    Join Date
    May 2011
    You need to know the min insertion that Ibis recommends for that bike.

  3. #3
    mtbr member
    Join Date
    Aug 2008
    Being using a shim on myHD since the day I bought it. 2011

  4. #4
    mtbr member
    Join Date
    Nov 2010
    i use shim too, no problem at all.

  5. #5
    Reputation: derby's Avatar
    Join Date
    Jan 2004
    100mm should be fine. 4" is commonly recommended for minimum seat post depth and post shims, 100mm is nearly 4".

    Posts slip down while riding easier when using a shim. Use a friction grease, such as FinishLine Fiber Grip. This will avoid the need to over tighten the seat collar.

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